Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server."

Question

I have couple of update panels and jquery tabs on page. And also I am loading couple user controls on update panels. After user waited for couple of minutes (not checked the

Answer 1

This solution is helpful too:

Add validateRequest="false" in the <%@ Page directive.

This is because ASP.net examines input from the browser for dangerous values. More info in this link